نتایج جستجو برای: microwave assisted synthesis

تعداد نتایج: 576400  

Journal: :Organic letters 2008
George A Kraus Haitao Guo

The reaction of (2-aminobenzyl) triphenylphosphonium bromide with aromatic aldehydes or alpha,beta-unsaturated aldehydes under microwave-assisted conditions constitutes a new synthesis of 2-substituted indoles in high yields (81-97%) in a one-pot reaction. The adduct from indole-4-carboxaldehyde was an advanced intermediate in the synthesis of arcyriacyanin A.

Journal: :Chemical communications 2015
Pamela Thompson Vani Lakshminarayanan Nitin T Supekar Judy M Bradley Peter A Cohen Margreet A Wolfert Sandra J Gendler Geert-Jan Boons

A strategy for the linear synthesis of a sialylated glycolipopeptide cancer vaccine candidate has been developed using a strategically designed sialyl-Tn building block and microwave-assisted solid-phase peptide synthesis. The glycolipopeptide elicited potent humoral and cellular immune responses. T-cells primed by such a vaccine candidate could be restimulated by tumor-associated MUC1.

2012
James W. Puckett Joshua T. Green Peter B. Dervan

Microwave synthesis was utilized to rapidly build Py-Im polyamides in high yields and purity using Boc-protection chemistry on Kaiser oxime resin. A representative polyamide targeting the 5'-WGWWCW-3' (W = A or T) subset of the consensus Androgen and Glucocorticoid Response Elements was synthesized in 56% yield after 20 linear steps and HPLC purification. It was confirmed by Mosher amide deriva...

Journal: :Organic letters 2002
Hernando J Olivos Prasanna G Alluri M Muralidhar Reddy Derek Salony Thomas Kodadek

Microwave irradiation reduces the reaction time for the solid-phase synthesis of peptoids. Under these conditions, coupling of each residue requires only 1 min. The purity and yields of peptoids synthesized in this way are as good as or better than those achieved using standard methods. [reaction: see text]

2007
B VAIDHYANATHAN K J RAO K J Rao

A fast, efficient and novel method of preparation of hydroxyapatite using microwaves has been described.

2013
AMIT DWIVEDI ANSHU SINGH ANIL MISHRA

The high commercial demand for quinoxalines needs a rapid, greener and safer synthetic method among the chemists. A series of quinoxaline derivatives has been synthesized by condensation of diamines and dicarboniles in microwave heating conditions and in solvent free media. This environmentally benign synthetic approach gives us excellent yields (80-90%) in shorter reaction time (3.5 minutes.)....

Journal: :The Journal of organic chemistry 2006
Hartmut Schirok

7-Azaindoles are versatile building blocks, especially in medicinal chemistry, where they serve as bioisosteres of indoles or purines. Herein, we are presenting a robust and flexible synthesis of 1,3- and 1,3,6-substituted 7-azaindoles starting from nicotinic acid derivatives or 2,6-dichloropyridine, respectively. Microwave heating dramatically accelerates the penultimate reaction step, an epox...

2012
Shu-Jiang Tu Bo Jiang

The fields of combinatorial and automated medicinal chemistry have emerged to meet the increasing requirement of new compounds for drug discovery, where speed is of the essence (Loupy, 2002). In this regard, domino (or tandem, or cascade) reactions where “two or more bond-forming transformations take place under the same reaction conditions without adding additional reagents and catalysts, and ...

H. Orojlou M. R. Parvizi M. Sahooli R. Saboori S. Sabbaghi,

In the past decades, many methods have been developed to synthesize zero- dimensional  nanoparticles, quasi–one–dimensional (1D) CuO nanostructures, such as metal organic deposition technique,  microwave irradiation, sol-gel-like dip  technique, reverse micelle-assisted route, chemical method, and simple template free solution route. Among those synthesis methods, hydrothermal and chemical reac...

Journal: :JAMDS 2001
Easwaran Balakrishnan Mark I. Nelson X. Dong Chen

The use of microwave heating to initiate combustion synthesis has been increasingly investigated in recent years because of its advantages over traditional methods. A simple mathematical model is used to model these experiments. The microwave power absorption term is modelled as the product of an Arrhenius reaction term with a function that decays exponentially with distance. The former represe...

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